Water is being poured at the rate of $36 \ m^3/min$ into a cylindrical vessel,whose circular base has a radius of $3 \ m$. The rate at which the water level in the cylinder is rising is:
- A$4 \pi \ m/min$
- B$\frac{4}{\pi} \ m/min$
- C$\frac{1}{4 \pi} \ m/min$
- D$\frac{\pi}{4} \ m/min$
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